▎ 摘　　要

NOVELTY - An interface modified tin-lead perovskite solar battery comprises conductive glass layer, poly(3,4 ethylenedioxythiophene)polystyrene sulfonate layer, modified layer, formamidinium-methyl ammonium-tin-lead-iodide polycrystalline film, electronic transmission layer and metal electrode layer. The material of the modified layer is nitrogen and chlorine co-doped graphene quantum dot. USE - Interface modified tin-lead perovskite solar battery used in series solar cell technology and other new-type thin film solar battery such as dye-sensitized solar battery and organic solar battery. ADVANTAGE - The method provides an interface modified tin-lead perovskite solar battery with high photoelectric conversion efficiency and high open circuit voltage. The method uses P-type doping enhancement of nitrogen and chlorine co-doped graphene quantum dot to induce the energy level arrangement which is most matched with the perovskite layer, nitrogen, and the chlorine co-dopened graphene quantum dots can passivate the defect state on the interface by the conjugated effect of graphene quantum dot and the electronegativity of chlorine, thus improves the efficiency of interface charge transmission. DETAILED DESCRIPTION - An interface modified tin-lead perovskite solar battery comprises conductive glass layer, poly(3,4 ethylenedioxythiophene)polystyrene sulfonate (PEDOT: PSS) layer, modified layer, formamidinium-methyl ammonium-tin-lead-iodide(FA0.6MA0.4Sn0.6Pb0.4I3) polycrystalline film, electronic transmission layer and metal electrode layer. The material of the modified layer is nitrogen and chlorine co-doped graphene quantum dot. An INDEPENDENT CLAIM is included for preparation of interface modified tin-lead perovskite solar cell.